HomeMy WebLinkAboutCERTIFICATION LETTERRE:CERTIFICATION LETTER
Project Address: DONALD ROBINSON Residence
6789 PICANTE CIRCLE
FORT PIERCE, FL 34951
Design Criteria:
- Applicable Codes =2020 7th Edition FBC, 2020 7th Edition FRC, 2018 IBC/IEBC ASCE 7-16, and 2018 NDS
- Risk Category = II
- Wind Speed = 152 mph, Exposure Category C, Partially/Fully Enclosed Method
- Ground Snow Load = 0 psf
- Roof 1: 2x4 @ 24" OC, Roof DL = 8 psf, Roof LL/SL = 19 psf (Non-PV), Roof LL/SL = 0 psf (PV)
To Whom It May Concern,
Sincerely,
September 2, 2021
Yuri Yurianto S.E, P.E.
A jobsite survey of the existing framing system of the address indicated above was provided. All structural evaluation is based on the
site inspection observations and the design criteria listed above.
Existing roof structural framing has been reviewed for additional loading due to installation of PV Solar System on the roof. The
structural review applies to the sections of roof that is directly supporting the solar PV system.
Based on this evaluation, I certify that the alteration to the existing structure by installation of the PV system meets the requirements of
the applicable existing building and/or new building provisions adopted/referenced above.
Additionally, the PV module assembly including attachment hardware has been reviewed to be in accordance with the manufacturer’s
specifications and to meet and/or exceed the requirements set forth by the referenced codes.
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun‐corp.com | www.barun‐corp.com
By Yuri at 10:09:28 AM, 9/2/2021
Roof 1
PV module weight 2.5 psf
Hardware assembly weight 0.5 psf
PV‐DL 3 psf
Existing Roofing Material Comp Roof 1 layers 2.5 psf
Underlayment 0.5 psf
Solid‐Sheathing 2.5 psf
Rafter Size and Spacing 2 x4 @ 24 in. O.C. 0.73 psf
Vaulted ceiling No 0 psf
Miscellaneous 1.5 psf
Total Roof Dead Load R‐DL 8 psf
Expression
Roof Live Load Lo 20.0 psf
Member Tributary Area At < 200 sf
Roof 1 Roof Pitch 5/12 or 22°
Trubutary Area Reduction R1 1
Slope Roof Reduction R2 0.95
Reduced Roof Live Load Lr = Lo (R1) (R2)19.0 psf
Ground Snow Load pg 0
Effective Roof Slope 22°
Snow Importance Factor Is 1.0
Snow Exposure Factor Ce 1.0
Snow Thermal Factor Ct 1.1
Minimum Flat Roof Snow Load pf‐min 0
Flat Roof Snow Load pf 0
Roof Slope Factor Cs‐roof 1.00
ps‐roof 0.00
Roof Slope Factor Cs‐pv 0.80
ps‐pv 0.00
Snow Load
Sloped Roof Snow Load on PV
Slope Roof Snow Load on Roof
Value
Material Panel AreaRoof Dead Load (R‐DL)
Reduced Roof Live Load (Lr)
PV System Dead Load (PV‐DL)
(All other surfaces)
(Unobstructed slippery surfaces)
Value
Barun Corp | Design and Engineering | 610.202.4506 | chrisk@barun‐corp.com | www.barun‐corp.com
Roof Dead Load
Comp Shingle Roof 2.50 psf
Insulation 0.50 psf
Sheathing 2.50 psf
Framing 0.73 psf
Miscellaneous 1.50 psf
Sum 7.73 psf
PV DL 3 psf
Roof Live Load 19.5 psf
Roof Live Load (PV) 0 psf
Snow Load 0 psf
Existing With PV
DL (psf) 7.73 10.73
Lr (psf) 19.50 0.00
S (psf) 0.00 0.00
Existing With PV
(D + Lr) / Cd = 21.78 11.92
(D + S) / Cd = 6.72 9.33
(Cd = Load Duration Factor = 0.9 for DL, 1.15 for SL, and 1.25 for Lr)
Maximum Gravity Load 21.78 11.92
Load Increase (%)‐45.27% OK
IBC Provision 2018
*The requirements of Section 806.2 of the 2018 IEBC are met and the
structure is permitted to remain unaltered.
Barun Corp I Design and Engineering I 610.202.4506 I chrisk@barun‐corp.com I www.barun‐corp.com
Ultimate Wind Speed (mph)152 Roof Pitch (degrees) 22
Risk Category II Roof Type Gable
Exposure Category C Kd 0.85
Mean Roof Height (ft)15 Kzt 1
PV DL (psf)3 Kz 0.85
qh = 0.00256*Kz*Kzt*Kd*Ke*V^2 = 42.66
a (ft) = 3.00
array edge factor γE= 1.50
Solar panel pressure eq. factor γa= 0.6
Hardware Type
Allowable Load (lb) 300 lbs for S-5!
Maximum X ‐ Spacing (ft) (Zone 1&2e)4.00
Maximum Y ‐ Spacing (ft) (Zone 1&2e)1.65
Maximum X ‐ Spacing (ft) (Zone 2r‐3e)3.00
Maximum Y ‐ Spacing (ft) (Zone 2r‐3e)1.65
Maximum X ‐ Spacing (ft) (Zone 3r)2.00
Maximum Y ‐ Spacing (ft) (Zone 3r)1.65
Roof Zone GCp (‐) Uplift Uplift Pressure (psf) Pullout Force (lbs)
1, 2e ‐1.50 ‐32.89 217.05
2r, 2n, 3e ‐2.50 ‐55.92 276.83
3r ‐3.60 ‐81.27 268.18
* Wind Calculation is based on ASCE7‐16, 29.4 ‐ C&C, LC#7: 0.6D + 0.6W Used
6.60
Effective Wind Area (ft2)
4.95
Effective Wind Area (ft2)
3.30
Site Information
Design Calculations
Design Wind Pressure Calculation for Solar Panel on Roof
Effective Wind Area (ft2)